diff --git a/src/gallium/drivers/iris/iris_bufmgr.c b/src/gallium/drivers/iris/iris_bufmgr.c
index 6c72e24a1e5..e04712a2540 100644
--- a/src/gallium/drivers/iris/iris_bufmgr.c
+++ b/src/gallium/drivers/iris/iris_bufmgr.c
@@ -1079,8 +1079,14 @@ iris_bo_alloc(struct iris_bufmgr *bufmgr,
                       (bufmgr->vram.size > 0 && !local) ||
                       (flags & BO_ALLOC_COHERENT);
    bool is_scanout = (flags & BO_ALLOC_SCANOUT) != 0;
-   enum iris_mmap_mode mmap_mode =
-      !local && is_coherent && !is_scanout ? IRIS_MMAP_WB : IRIS_MMAP_WC;
+
+   enum iris_mmap_mode mmap_mode;
+   if (!bufmgr->all_vram_mappable && heap == IRIS_HEAP_DEVICE_LOCAL)
+      mmap_mode = IRIS_MMAP_NONE;
+   else if (!local && is_coherent && !is_scanout)
+      mmap_mode = IRIS_MMAP_WB;
+   else
+      mmap_mode = IRIS_MMAP_WC;
 
    simple_mtx_lock(&bufmgr->lock);